Single pass stats with generators in Python

gistfile1.py

import random
from math import sqrt

def compute(gen):
    def stat(x):
        stat.max = x if stat.max is None else stat.max
        stat.min = x if stat.min is None else stat.min

        stat.sum  += x
        stat.sum2 += x*x
        stat.n    += 1.0
        stat.max = x if x>stat.max else stat.max
        stat.min = x if x<stat.min else stat.min

        s, sum2, n = stat.sum, stat.sum2, stat.n
        return n, s, s/n, sqrt(sum2/n - s*s/n/n), stat.max, stat.min
    
    stat.sum = stat.sum2 = stat.n = 0
    stat.max = stat.min = None
    x = [stat(v) for v in gen][-1]
    return x

def random_int_list(size=100, start=0, end=1000):
    return (random.randrange(start,end,1) for x in xrange(size))
    
    
if __name__ == '__main__':
    r = compute(random_int_list())
    print r